Researchers have shed new light on how a type of heart valve disease -- aortic valve stenosis -- progresses differently in males and females.

Tyron Molteni - stock.adobe.com Men have an X and a Y chromosome, while women have two X chromosomes. Scientists have long dismissed one of the female X chromosomes as largely inactive ...

The final, formatted version of the article will be published soon. The Y chromosome, transmitted exclusively through the paternal line, is a well-established tool for verifying genealogical data. The ...

Some major medical associations are pushing back against the Department of Health and Human Services' updated definitions of ... such as anatomy and chromosomes." The CDC's website defines gender ...

"Those are the options." Most commonly, a person is born with two X chromosomes (female) or an X and a Y (male). But this is not always the case. Mace’s claim ignores the existence of several ...

Of these, 44 are autosomes and 2 are sex chromosomes. A person's sex is determined by the X and Y chromosomes with males having one X and one Y chromosome (an XY arrangement) and females having two X ...

It is also significant that the transcriptome re-analysis was performed with an improved genome assembly that also includes the sex chromosomes, thus expanding the Z/W chromosome gene analyses in ...

Kennedy Jr.’s new guidance on biological differences between men and women, claiming such "new definitions" are more restrictive than those used by "most scientists." The HHS released guidance ...

A recent Trump executive order defines sex based on gamete size. But the order oversimplifies genetics, hormones and reproductive biology.

Trump’s definition of sex is rigid and unforgiving ... will determine its fetal fate of becoming male or female. If the Y chromosome is present in an embryo, “undifferentiated” gonads ...